Answer:
18
Explanation:
When you scale down you divide. it showed that 9 = 3. to go from 9 to 3 you divide by 3. So you have to do the same thing for the other number. So, 18 divided by 3, which is 6.
When you scale up you multiply. it showed that 18 = 36. To get from 18 to 36 you multiply by 2. So, you do the same thing to the other number, 9 times 2, which is 18.